Ablation is defined as the removal of material from the surface of an object by vaporization, chipping, or other erosive processes. The magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth The process in which incident radiated energy is retained without reflection or transmission on passing through a medium; "the absorption of photons by atoms or molecules" A measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber; "absorptance equals 1 minus transmittance" The spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths The ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present The rate of change of velocity The formation of a celestial object by the effect of gravity pulling together surrounding objects and gases A stony meteor lacking chondrules The study of the physical properties of sound A wave that transmits sound The process of adapting to something (such as environmental conditions) Any process that occurs without gain or loss of heat The act of making something different The accumulation of molecules of a gas to form a thin film on the surface of a solid A stony meteorite consisting of silicate minerals A glow sometimes seen in the sky after sunset How long something has existed To grow old or older Make older The mixture of gases surrounding the Earth A system that keeps air cool and dry Pollution of the atmosphere The ratio of reflected to incident light An annual publication containing tabular information in a particular field or fields arranged according to the calendar of a given year A positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes An instrument that measures the height above ground; used in navigation A pungent gas compounded of nitrogen and hydrogen (NH3) Electronic equipment that increases strength of signals passing through it The maximum displacement of a periodic wave Greatness of magnitude An investigation of the component parts of a whole and their relations in making up the whole The abstract separation of a whole into its constituent parts in order to study the parts and their relations A branch of mathematics involving calculus and the theory of limits; sequences and series and integration and differentiation A gauge for recording the speed and direction of wind The product of the momentum of a rotating body and its distance from the axis of rotation The rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute The property of being anisotropic; having a different value when measured in different directions The parallax of a celestial body using two points in the earth's orbit around the sun as the baseline Only a thin outer disk of the sun can be seen Period between successive perigees; approximately 27.5546 days Time of the earth's revolution from perihelion to perihelion again; 365 days and 6 hr and 13 min and 53.1 sec Position of a planet as defined by its angular distance from its perihelion (as observed from the sun) The point opposite in direction from the solar apex; the point the solar system is moving away from An electrical device that sends or receives radio signals Matter consisting of elementary particles that are the antiparticles of those making up normal substances The antiparticle of a neutrino The point of maximum displacement in a periodic system A particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy An unstable negatively charged proton; the antiparticle of a proton A device that controls amount of light admitted The point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars Apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun Apoapsis in orbit; the point of greatest distance of the elliptical orbit of an astronomical object from its center of attraction, which is generally the center of mass of the system. A domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar Electrical conduction through a gas in an applied electric field A continuous portion of a circle A celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars An orderly arrangement; "an array of troops in battle order" An impressive display; "it was a bewildering array of books"; "his tools were in an orderly array on the basement wall" Especially fine or decorative clothing An arrangement of aerials spaced to give desired directional characteristics Lay out orderly or logically in a line or as if in a line; "lay out the clothes"; "lay out the arguments" Align oneself with a group or a way of thinking Man-made equipment that orbits around the earth or the moon The point at which an orbit crosses the ecliptic plane going north Any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) Shaped like a star The region of interplanetary space between Mars and Jupiter where most asteroids are found (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point The branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life The branch of astronomy that studies the motion of natural and artificial bodies in space An early form of sextant A pseudoscience claiming divination by the positions of the planets and sun and moon The branch of astronomy that deals with the measurement of the position and motion of celestial bodies A physicist who studies astronomy A unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers) The branch of physics that studies celestial bodies and the universe as a whole The branch of astronomy concerned with the physical and chemical properties of celestial bodies (Greek mythology) a Titan who was forced by Zeus to bear the sky on his shoulders A collection of maps in book form The 1st cervical vertebra A figure of a man used as a supporting column A particular environment or surrounding influence; "there was an atmosphere of excitement" A unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade The weather or climate at some place; "the atmosphere was thick with fog" The envelope of gases surrounding any celestial body (physics and chemistry) the smallest component of an element having the chemical properties of the element (nontechnical usage) a tiny piece of anything A timepiece that derives its time scale from the vibration of atoms or molecules The branch of physics that studies the internal structure of atomic nuclei (physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the element Weakening in force or intensity; "attenuation in the volume of the sound" The property of something that has been weakened or reduced in thickness or density The first light of day; "we got up before dawn"; "they talked until morning" An atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force (Roman mythology) goddess of the dawn; counterpart of Greek Eos September 22 (astronomy) the equinoctial point that lies in the constellation of Virgo A straight line through a body or figure that satisfies certain conditions The main stem or central part about which plant organs or plant parts such as branches are arranged In World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations; "the Axis opposed the Allies in World War II" A group of countries in special alliance The 2nd cervical vertebra; serves as a pivot for turning the head The center around which something rotates The azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian A person's social heritage: previous experience or training; "he is a lawyer with a sports background" The part of a scene (or picture) that lies behind objects in the foreground; "he posed her against a background of rolling hills" Information that is essential to understanding a situation or problem; "the embassy filled him in on the background of the incident" Extraneous signals that can be confused with the phenomenon to be observed or measured; "they got a bad connection and could hardly hear one another over the background signals" Relatively unimportant or inconspicuous accompanying situation; "when the rain came he could hear the sound of thunder in the background" The state of the environment in which a situation exists; "you can't do that in a university setting" (computer science) the area of the screen in graphical user interfaces against which icons and windows appear Scenery hung at back of stage Understate the importance or quality of; "he played down his royal ancestry" Extraneous noise contaminating sound measurements that cannot be separated from the desired signal Radiation coming from sources other than those being observed An instrument that measures atmospheric pressure Any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 A bowl-shaped vessel; usually used for holding food or liquids; "she mixed the dough in a large basin" The quantity that a basin will hold; "a basinful of water" A natural depression in the surface of the land often with a lake at the bottom of it; "the basin of the Great Salt Lake" The entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet; "flood control in the Missouri basin" A bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face; "he ran some water in the basin and splashed it on his face" (cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature A system of two stars that revolve around each other under their mutual gravitation A positional system of numeration that uses binary digits and a radix of two The science that studies living organisms Characteristic life processes and phenomena of living organisms; "the biology of viruses" All the plant and animal life of a particular region The ratio of live births in an area to the population of that area; expressed per 1000 population per year A region of space resulting from the collapse of a star; extremely high gravitational field A reflex that closes and opens the eyes rapidly Closing the eyes intermittently and rapidly; "he stood blinking in the bright sunlight" Informal intensifiers; "what a bally (or blinking) nuisance"; "a bloody fool"; "a crashing bore"; "you flaming idiot" An especially luminous meteor (sometimes exploding) An instrument that measures heat radiation; extremely sensitive (physics) statistical law obeyed by a system of particles whose wave function is not changed when two particles are interchanged (the Pauli exclusion principle does not apply) Any particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons The layer of slower flow of a fluid past a surface A structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc. A circuit consisting of two branches (4 arms arranged in a diamond configuration) across which a meter is connected Something resembling a bridge in form or function; "his letters provided a bridge across the centuries" The hard ridge that forms the upper part of the nose; "her glasses left marks on the bridge of her nose" Any of various card games based on whist for four players A wooden support that holds the strings up A denture anchored to teeth on either side of missing teeth The link between two lenses; rests on the nose An upper deck where a ship is steered and the captain stands Connect or reduce the distance between Make a bridge across; "bridge a river" Cross over on a bridge The location of a visual perception along a continuum from black to white Intelligence as manifested in being quick and witty The quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun" A hollow globule of gas (e.g., air or carbon dioxide) A speculative scheme that depends on unstable factors that the planner cannot control; "his proposal was nothing but a house of cards"; "a real estate bubble" An impracticable and illusory idea; "he didn't want to burst the newcomer's bubble" A dome-shaped covering made of transparent glass or plastic Form, produce, or emit bubbles; "The soup was bubbling" Flow in an irregular current with a bubbling noise; "babbling brooks" Rise in bubbles or as if in bubbles; "bubble to the surface" Cause to form bubbles; "bubble gas through a liquid" Expel gas from the stomach; "In China it is polite to burp at the table" Something that bulges out or is protuberant or projects from its surroundings; "the gun in his pocket made an obvious bulge"; "the hump of a camel"; "he stood on the rocky prominence"; "the occipital protuberance was well developed"; "the bony excrescence between its horns" Swell or protrude outwards; "His stomach bulged after the huge meal" Bulge out; form a bulge outward, or be so full as to appear to bulge Bulge outward; "His eyes popped" Cause to bulge or swell outwards The act of exploding or bursting; "the explosion of the firecrackers awoke the children"; "the burst of an atom bomb creates enormous radiation aloft" Rapid simultaneous discharge of firearms; "our fusillade from the left flank caught them by surprise" A sudden flurry of activity (often for no obvious reason); "a burst of applause"; "a fit of housecleaning" A sudden intense happening; "an outburst of heavy rain"; "a burst of lightning" Come open suddenly and violently, as if from internal pressure; "The bubble burst" Force out or release suddenly and often violently something pent up; "break into tears"; "erupt in anger" Burst outward, usually with noise; "The champagne bottle exploded" Move suddenly, energetically, or violently; "He burst out of the house into the cool night" Be in a state of movement or action; "The room abounded with screaming children"; "The garden bristled with toddlers" Emerge suddenly; "The sun burst into view" Cause to burst; "The ice broke the pipe" Break open or apart suddenly and forcefully; "The dam burst" A quantity of explosive to be set off at one time; "this cartridge has a powder charge of 50 grains" A system of timekeeping that defines the beginning and length and divisions of the year A list or register of events (appointments or social events or court cases etc); "I have you on my calendar for next Monday" A tabular array of the days (usually for one year) Enter into a calendar The act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument; "the thermometer needed calibration" Equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other) Television equipment consisting of a lens system that focuses an image on a photosensitive mosaic that is scanned by an electron beam A lens that focuses the image in a camera A ravine formed by a river in an area with little rainfall The act of forcibly dispossessing an owner of property A process whereby a star or planet holds an object in its gravitational field Any process in which an atomic or nuclear system acquires an additional particle The act of taking of a person by force The removal of an opponent's piece from the chess board Succeed in representing or expressing something intangible; "capture the essence of Spring"; "capture an idea" Attract; cause to be enamored; "She captured all the men's hearts" Succeed in catching or seizing, especially after a chase; "We finally got the suspect"; "Did you catch the thief?" Bring about the capture of an elementary particle or celestial body and causing it enter a new orbit; "This nucleus has captured the slow-moving neutrons"; "The star captured a comet" Take possession of by force, as after an invasion; "the invaders seized the land and property of the inhabitants"; "The army seized the town"; "The militia captured the castle" Capture as if by hunting, snaring, or trapping; "I caught a rabbit in the trap today" A heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis A toxic colorless flammable liquid (CS2); used in the manufacture of rayon and cellophane and carbon tetrachloride and as a solvent for rubber An odorless very poisonous gas that is a product of incomplete combustion of carbon A book or pamphlet containing an enumeration of things; "he found it in the Sears catalog" A complete list of things; usually arranged systematically; "it does not pretend to be a catalog of his achievements" Make a catalogue, compile a catalogue; "She spends her weekends cataloguing" Make an itemized list or catalog of; classify; "He is cataloguing his photographic negatives" A negatively charged electrode that is the source of electrons entering an electrical device The positively charged terminal of a voltaic cell or storage battery that supplies current Any chemical substance that burns or destroys living tissue Harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique" Of a substance, especially a strong acid; capable of destroying or eating away by chemical action The great circle on the celestial sphere midway between the celestial poles The branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies One of two points of intersection of the Earth's axis and the celestial sphere The apparent surface of the imaginary sphere on which celestial bodies appear to be projected An area that is approximately central within some larger region; "it is in the center of town"; "they ran forward into the heart of the struggle"; "they were in the eye of the storm" The piece of ground in the outfield directly ahead of the catcher; "he hit the ball to deep center" A building dedicated to a particular activity; "they were raising money to build a new center for research" A point equidistant from the ends of a line or the extremities of a figure The choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story" The object upon which interest and attention focuses; "his stories made him the center of the party" A cluster of nerve cells governing a specific bodily process; "in most people the speech center is in the left hemisphere" The middle of a military or naval formation; "they had to reinforce the center" (basketball) the person who plays center on a basketball team (football) the person who plays center on the line of scrimmage and snaps the ball to the quarterback; "the center fumbled the handoff" A place where some particular activity is concentrated; "they received messages from several centers" Politically moderate persons; centrists (ice hockey) the person who plays center on a hockey team The sweet central portion of a piece of candy that is enclosed in chocolate or some other covering Mercantile establishment consisting of a carefully landscaped complex of shops representing leading merchandisers; usually includes restaurants and a convenient parking area; a modern version of the traditional marketplace; "a good plaza should have a movie house"; "they spent their weekends at the local malls" The position on a hockey team of the player who participates in the face off at the beginning of the game (American football) the position of the player on the line of scrimmage who puts the ball in play; "it is a center's responsibility to get the football to the quarterback" A position on a basketball team of the player who participates in the jump that starts the game Center upon; "Her entire attention centered on her children"; "Our day revolved around our work" Direct one's attention on something; "Please focus on your studies and not on your hobbies" Move into the center; "That vase in the picture is not centered" Equally distant from the extremes Of or belonging to neither the right nor the left politically or intellectually Point representing the mean position of the matter in a body The outward force on a body moving in a curved path around another body The inward force on a body moving in a curved path around another body (Roman mythology) goddess of agriculture; counterpart of Greek Demeter The largest asteroid and the first discovered Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter Luminescence resulting from a chemical reaction as the oxidation of luciferin in fireflies The science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions The chemical composition and properties of a substance or object; "the chemistry of soil" The way two individuals relate to each other; "their chemistry was wrong from the beginning -- they hated each other"; "a mysterious alchemy brought them together" A rock of meteoric origin containing chondrules An optical aberration in which the image has colored fringes A gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun An accurate clock (especially used in navigation) The official time in a local region (adjusted for location around the Earth); established by law or custom The act of distributing things into classes or categories of the same type A group of people or things arranged by class or category The basic cognitive process of arranging into classes or categories Restriction imposed by the government on documents or weapons that are available only to certain authorized people A timepiece that shows the time of day Measure the time or duration of an event or action or the person who performs an action in a certain period of time; "he clocked the runners" (cosmology) a universe that is spatially closed and in which there is sufficient matter to halt the expansion that began with the big bang; the visible matter is only 10 percent of the matter required for closure but there may be large amounts of dark matter Any collection of particles (e.g., smoke or dust) or gases that is visible A visible mass of water or ice particles suspended at a considerable altitude Out of touch with reality; "his head was in the clouds" A cause of worry or gloom or trouble; "the only cloud on the horizon was the possibility of dissent by the French" Suspicion affecting your reputation; "after that mistake he was under a cloud" A group of many things in the air or on the ground; "a swarm of insects obscured the light"; "clouds of blossoms"; "it discharged a cloud of spores" Make overcast or cloudy; "Fall weather often overcasts our beaches" Make less visible or unclear; "The stars are obscured by the clouds"; "the big elm tree obscures our view of the valley" Billow up in the form of a cloud; "The smoke clouded above the houses" Make gloomy or depressed; "Their faces were clouded with sadness" Place under suspicion or cast doubt upon; "sully someone's reputation" Make less clear; "the stroke clouded memories of her youth" Colour with streaks or blotches of different shades Make milky or dull; "The chemical clouded the liquid to which it was added" The sound of a horse's hoofs hitting on a hard surface A grouping of a number of similar things; "a bunch of trees"; "a cluster of admirers" Come together as in a cluster or flock; "The poets constellate in this town every summer" Gather or cause to gather into a cluster; "She bunched her fingers into a fist" A thin layer covering something; "a second coat of paint" A decorative texture or appearance of a surface (or the substance that gives it that appearance); "the boat had a metallic finish"; "he applied a coat of a clear finish"; "when the finish is too thin it is difficult to apply evenly" A heavy fabric suitable for coats The work of applying something; "the doctor prescribed a topical application of iodine"; "a complete bleach requires several applications"; "the surface was ready for a coating of paint"; Optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror The state of cohering or sticking together Logical and orderly and consistent relation of parts An abrupt failure of function or complete physical exhaustion; "the commander's prostration demoralized his men" A natural event caused by something suddenly falling down or caving in; "the roof is in danger of collapse"; "the collapse of the old star under its own gravity" The act of throwing yourself down; "he landed on the bed with a great flop" A sudden large decline of business or the prices of stocks (especially one that causes additional failures) Break down, literally or metaphorically; "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice" Collapse due to fatigue, an illness, or a sudden attack Fold or close up; "fold up your umbrella"; "collapse the music stand" Fall apart; "the building crumbled after the explosion"; "Negotiations broke down" Suffer a nervous breakdown Lose significance, effectiveness, or value; "The school system is collapsing"; "The stock market collapsed" The accurate adjustment of the line of sight of a telescope A small telescope attached to a large telescope to use in setting the line of the larger one Optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam (physics) a brief event in which two or more bodies come together; "the collision of the particles resulted in an exchange of energy and a change of direction" An accident resulting from violent impact of a moving object; "three passengers were killed in the collision"; "the collision of the two ships resulted in a serious oil spill" A conflict of opposed ideas or attitudes or goals; "a collision of interests" A visual attribute of things that results from the light they emit or transmit or reflect; "a white color is made up of many different wavelengths of light" Interest and variety and intensity; "the Puritan Period was lacking in color"; "the characters were delineated with exceptional vividness" The timbre of a musical sound; "the recording fails to capture the true color of the original music" A race with skin pigmentation different from the white race (especially Blacks) An outward or token appearance or form that is deliberately misleading; "he hoped his claims would have a semblance of authenticity"; "he tried to give his falsehood the gloss of moral sanction"; "the situation soon took on a different color" Any material used for its color; "she used a different color for the trim" (physics) the characteristic of quarks that determines their role in the strong interaction; "each flavor of quarks comes in three colors" The appearance of objects (or light sources) described in terms of a person's perception of their hue and lightness (or brightness) and saturation Add color to; "The child colored the drawings"; "Fall colored the trees"; "colorize black and white film" Affect as in thought or feeling; "My personal feelings color my judgment in this case"; "The sadness tinged his life" Modify or bias; "His political ideas color his lectures" Decorate with colors; "color the walls with paint in warm tones" Give a deceptive explanation or excuse for; "color a lie" Change color, often in an undesired manner; "The shirts discolored" Having or capable of producing colors; "color film"; "he rented a color television"; "marvelous color illustrations" Quantitative chemical analysis by color using a colorimeter The normal ability to see colors A state of deep and often prolonged unconsciousness; usually the result of disease or injury (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds) (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit The act of examining resemblances; "they made a comparison of noise levels"; "the fractions selected for comparison must require pupils to consider both numerator and denominator" Relation based on similarities and differences Qualities that are comparable; "no comparison between the two books"; "beyond compare" An abstract part of something; "jealousy was a component of his character"; "two constituents of a musical composition are melody and harmony"; "the grammatical elements of a sentence"; "a key factor in her success"; "humor: an effective ingredient of a speech" Something determined in relation to something that includes it; "he wanted to feel a part of something bigger than himself"; "I read a portion of the manuscript"; "the smaller component is hard to reach"; "the animal constituent of plankton" An artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system" The spatial property resulting from the arrangement of parts in relation to each other and to the whole; "harmonious composition is essential in a serious work of art" The way in which someone or something is composed A mixture of ingredients A musical work that has been created; "the composition is written in four movements" Musical creation The act of creating written works; "writing was a form of therapy for him"; "it was a matter of disputed authorship" Art and technique of printing with movable type An essay (especially one written as an assignment); "he got an A on his composition" Something that is created by arranging several things to form a unified whole; "he envied the composition of their faculty" A machine for performing calculations automatically An expert at calculation (or at operating calculating machines) (computer science) a sequence of instructions that a computer can interpret and execute; "the program required several hundred lines of code" (computer science) the technique of representing the real world by a computer program; "a simulation should imitate the internal processes and not merely the results of the thing being simulated" The branch of engineering science that studies (with the aid of computers) computable processes and structures The procedure of calculating; determining something by mathematical or logical methods (psychoanalysis) an unconscious process whereby two ideas or images combine into a single symbol; especially in dreams The process of changing from a gaseous to a liquid or solid state Atmospheric moisture that has condensed because of cold The process or result of becoming smaller or pressed together; "the contraction of a gas on cooling" A shortened version of a written work The act of increasing the density of something The transmission of heat or electricity or sound The temporal property of two things happening at the same time; "the interval determining the coincidence gate is adjustable" The state of being joined together An uninflected function word that serves to conjoin words or phrases or clauses or sentences The grammatical relation between linguistic units (words or phrases or clauses) that are connected by a conjunction (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac Something that joins or connects A quantity that does not vary A number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant" Unvarying in nature; "maintained a constant temperature"; "principles of unvarying validity" Steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star" Uninterrupted in time and indefinitely long continuing; "the ceaseless thunder of surf"; "in constant pain"; "night and day we live with the incessant noise of the city"; "the never-ending search for happiness"; "the perpetual struggle to maintain standards in a democracy"; "man's unceasing warfare with drought and isolation"; "unremitting demands of hunger" An arrangement of parts or elements; "the outcome depends on the configuration of influences at the time" A configuration of stars as seen from the earth The gradual movement and formation of continents (as described by plate tectonics) One of the large landmasses of the earth; "there are seven continents"; "pioneers had to cross the continent on foot" The European mainland; "Englishmen like to visit the Continent but they wouldn't like to live there" Having control over urination and defecation Abstaining from sexual intercourse; "celibate priests" A map having contour lines through points of equal elevation (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber) A word formed from two or more words by omitting or combining some sounds; "`won't' is a contraction of `will not'"; "`o'clock' is a contraction of `of the clock'" The act of decreasing (something) in size or volume or quantity or scope The opposition or dissimilarity of things that are compared; "in contrast to", "by contrast" The act of distinguishing by comparing differences A conceptual separation or distinction; "there is a narrow line between sanity and insanity" The perceptual effect of the juxtaposition of very different colors The range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness) Put in opposition to show or emphasize differences; "The middle school teacher contrasted her best student's work with that of her weakest student" To show differences when compared; be different; "the students contrast considerably in their artistic abilities" A system for controlling the operation of another system The transfer of heat through a fluid (liquid or gas) caused by molecular motion (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere The process of becoming cooler; a falling temperature A mechanism for keeping something cool; "the cooling was overhead fans" Greenwich Mean Time updated with leap seconds A system that uses coordinates to establish position A small group of indispensable persons or things; "five periodicals make up the core of their publishing program" The center of an object; "the ball has a titanium core" The central part of the Earth A cylindrical sample of soil or rock obtained with a hollow drill An organization founded by James Leonard Farmer in 1942 to work for racial equality The central meaning or theme of a speech or literary work (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories; "each core has three wires passing through it, providing the means to select and detect the contents of each bit" The chamber of a nuclear reactor containing the fissile material where the reaction takes place A bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil Remove the core or center from; "core an apple" The outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower An electrical discharge accompanied by ionization of surrounding atmosphere One or more circles of light seen around a luminous object (anatomy) any structure that resembles a crown in shape A long cigar with blunt ends The act of offering an improvement to replace a mistake; setting right A quantity that is added or subtracted in order to increase the accuracy of a scientific measure Something substituted for an error A rebuke for making a mistake A drop in stock market activity or stock prices following a period of increases; "market runups are invariably followed by a correction" The act of punishing; "the offenders deserved the harsh discipline they received" Treatment of a specific defect; "the correction of his vision with eye glasses" A reciprocal relation between two or more things A statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation); "what is the correlation between those two variables?" A statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin Of or from or pertaining to or characteristic of the cosmos or universe; "cosmic laws"; "cosmic catastrophe"; "cosmic rays" Inconceivably extended in space or time Highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds (cosmology) a hypothetical one-dimensional subatomic particle having a concentration of energy and the dynamic properties of a flexible loop The branch of astrophysics that studies the origin and evolution and structure of the universe An arbitrary constant in the equations of general relativity theory The metaphysical study of the origin and nature of the universe Table consisting of a horizontal surface over which business is transacted Game equipment (as a piece of wood, plastic, or ivory) used for keeping a count or reserving a space in various card or board games A calculator that keeps a record of the number of times something happens A piece of furniture that stands at the side of a dining room; has shelves and drawers A person who counts things A quick reply to a question or remark (especially a witty or critical one); "it brought a sharp rejoinder from the teacher" (computer science) a register whose contents go through a regular series of states (usually states indicating consecutive integers) A piece of leather forming the back of a shoe or boot; "a counter may be used to stiffen the material around the heel and to give support to the foot" A return punch (especially by a boxer) Speak in response; "He countered with some very persuasive arguments" Act in advance of; deal with ahead of time Indicating opposition or resistance In the opposite direction; "run counter" The act of counting; reciting numbers in ascending order; "the counting continued for several hours" A connection (like a clamp or vise) between two things so they move together A mechanical device that serves to connect the ends of adjacent objects The act of pairing a male and female for reproductive purposes; "the casual couplings of adolescents"; "the mating of some species occurs only in the spring" A bowl-shaped geological formation at the top of a volcano A faint constellation in the southern hemisphere near Hydra and Corvus A bowl-shaped depression formed by the impact of a meteorite or bomb The outer layer of the Earth A hard outer layer that covers something The trait of being rude and impertinent; inclined to take liberties Form a crust or form into a crust; "The bread crusted in the oven" The branch of physics that studies the phenomena that occur at very low temperatures A thermostat that operates at very low temperatures A flow of electricity through a conductor; "the current was measured in amperes" A steady flow of a fluid (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"; "the hose ejected a stream of water" Dominant course (suggestive of running water) of successive events or ideas; "two streams of development run through American history"; "stream of consciousness"; "the flow of thought"; "the current of history" Occurring in or belonging to the present time; "current events"; "the current topic"; "current negotiations"; "current psychoanalytic theories"; "the ship's current position" Point formed by two intersecting arcs (as from the intrados of a Gothic arch) A thin triangular flap of a heart valve Small elevation on the grinding surface of a tooth A colorless toxic gas with a pungent almond odor; has been used in chemical warfare An interval during which a recurring sequence of events occurs; "the never-ending cycle of the seasons" A series of poems or songs on the same theme; "Schubert's song cycles" A periodically repeated sequence of events; "a cycle of reprisal and retaliation" The unit of frequency; one hertz has a periodic interval of one second A single complete execution of a periodically repeated phenomenon; "a year constitutes a cycle of the seasons" A wheeled vehicle that has two wheels and is moved by foot pedals Cause to go through a recurring sequence; "cycle the laundry in this washing program" Pass through a cycle; "This machine automatically cycles" Ride a motorcycle Ride a bicycle Recur in repeating sequences (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force Absence of light or illumination An unilluminated area; "he moved off into the darkness" Absence of moral or spiritual values; "the powers of darkness" An unenlightened state; "he was in the dark concerning their intentions"; "his lectures dispelled the darkness" Having a dark or somber color A swarthy complexion A room in which photographs are developed An organized body of related information (computer science) a series of operations on data by a computer in order to retrieve or transform or classify information A decrease in rate of change; "the deceleration of the arms race" (physics) a rate of decrease in velocity The act of decelerating; decreasing the speed; "he initiated deceleration by braking" A condition inferior to an earlier condition; a gradual falling off from a better state A downward slope or bend (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere A polite refusal of an invitation An imperfection in a bodily system; "visual defects"; "this device permits detection of defects in the lungs" A failing or deficiency; "that interpretation is an unfortunate defect of our lack of information" An imperfection in an object or machine; "a flaw caused the crystal to shatter"; "if there are any defects you should send it back to the manufacturer" A mark or flaw that spoils the appearance of something (especially on a person's body); "a facial blemish" Desert (a cause, a country or an army), often in order to join the opposing cause, country, or army; "If soldiers deserted Hitler's army, they were shot" A change for the worse Alteration in the shape or dimensions of an object as a result of the application of stress to it The act of twisting or deforming the shape of something (e.g., yourself) A measuring instrument for determining optical or photographic density A measuring instrument for determining density or specific gravity Measuring the optical density of a substance by shining light on it and measuring its transmission The amount per unit size The spatial property of being crowded together The point at which an orbit crosses the ecliptic plane going south The act of working out the form of something (as by making a sketch or outline or plan); "he contributed to the design of a new instrument" An arrangement scheme; "the awkward design of the keyboard made operation difficult"; "it was an excellent design for living"; "a plan for seating guests" Something intended as a guide for making something else; "a blueprint for a house"; "a pattern for a skirt" A decorative or artistic work; "the coach had a design on the doors" An anticipated outcome that is intended or that guides your planned actions; "his intent was to provide a new translation"; "good intentions are not enough"; "it was created with the conscious aim of answering immediate needs"; "he made no secret of his designs" A preliminary sketch indicating the plan for something; "the design of a building" The creation of something in the mind Make or work out a plan for; devise; "They contrived to murder their boss"; "design a new sales strategy"; "plan an attack" Plan something for a specific role or purpose or effect; "This room is not designed for work" Create the design for; create or execute in an artistic or highly skilled manner; "Chanel designed the famous suit" Make a design of; plan out in systematic, often graphic form; "design a better mousetrap"; "plan the new wing of the museum" Create designs; "Dupont designs for the house of Chanel" Conceive or fashion in the mind; invent; "She designed a good excuse for not attending classes that day" Intend or have as a purpose; "She designed to go far in the world of business" The termination of something by causing so much damage to it that it cannot be repaired or no longer exists An event (or the result of an event) that completely destroys something A final state; "he came to a bad end"; "the so-called glorious experiment came to an inglorious end" The perception that something has occurred or some state exists; "early detection can often lead to a cure" The act of detecting something; catching sight of something The detection that a signal is being received A police investigation to determine the perpetrator; "detection is hard on the feet" Any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner Rectifier that extracts modulation from a radio carrier wave Electronic equipment that detects the presence of radio signals or radioactivity The act of determining the properties of something, usually by research or calculation; "the determination of molecular structures" The quality of being determined to do or achieve something; firmness of purpose; "his determination showed in his every movement"; "he is a man of purpose" A position or opinion or judgment reached after consideration; "a decision unfavorable to the opposition"; "his conclusion took the evidence into account"; "satisfied with the panel's determination" Deciding or controlling something's outcome or nature; "the determination of grammatical inflections" The act of making up your mind about something; "the burden of decision was his"; "he drew his conclusions quickly" A drawing intended to explain how something works; a drawing showing the relation between the parts Make a schematic or technical drawing of that shows interactions among variables or how something is constructed The length of a straight line passing through the center of a circle and connecting two points on the circumference A straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface) An equation containing differentials of a function When light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands Optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum A cluster of stars within an intricate cloud of gas and dust (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration The spread of social institutions (and myths and skills) from one society to another The property of being diffused or dispersed The act of dispersing or diffusing something; "the dispersion of the troops"; "the diffusion of knowledge" The magnitude of something in a particular direction (especially length or width or height) A construct whereby objects or individuals can be distinguished; "self-confidence is not an endearing property" One of three Cartesian coordinates that determine a position in space Magnitude or extent; "a building of vast proportions" Indicate the dimensions on; "These techniques permit us to dimension the human heart" Shape or form to required dimensions A thermionic tube having two electrodes; used as a rectifier A semiconductor that consists of a p-n junction An aerial half a wavelength long consisting of two rods connected to a transmission line at the center A pair of equal and opposite electric charges or magnetic poles separated by a small distance An antenna that transmits or receives signals only in a narrow angle A soiled or discolored appearance; "the wine left a dark stain" The act of changing the natural color of something by making it duller or dingier or unnatural or faded Directional antenna consisting of a parabolic reflector for microwave or radio frequency radiation In a decomposed state A loss (or serious disruption) of organization in some system; "a disintegration of personality" Separation into component parts The spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation Total destruction; "bomb tests resulted in the annihilation of the atoll" Something with a round shape resembling a flat circular plate; "the moon's disk hung in a cloudless sky" A flat circular plate Sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored Draw a harrow over (land) Spreading widely or driving off The spatial or geographic property of being scattered about over a range, area, or volume; "worldwide in distribution"; "the distribution of nerve fibers"; "in complementary distribution" An act of delaying or interrupting the continuity; "it was presented without commercial breaks"; "there was a gap in his account" A disorderly outburst or tumult; "they were amazed by the furious disturbance they had caused" An event that results in a displacement or discontinuity The act of causing disorder Breaking up and scattering by dispersion; "the dissipation of the mist" Dissolute indulgence in sensual pleasure Useless or profitless activity; using or expending or consuming thoughtlessly or carelessly; "if the effort brings no compensating gain it is a waste"; "mindless dissipation of natural resources" The property created by the space between two objects or points A distant region; "I could see it in the distance" Size of the gap between two places; "the distance from New York to Chicago"; "he determined the length of the shortest line segment joining the two points" Indifference by personal withdrawal; "emotional distance" The interval between two times; "the distance from birth to death"; "it all happened in the space of 10 minutes" A remote point in time; "if that happens it will be at some distance in the future"; "at a distance of ten years he had forgotten many of the details" Keep at a distance; "we have to distance ourselves from these events in order to continue living" Go far ahead of; "He outdistanced the other runners" A shape resulting from distortion An optical phenomenon resulting from the failure of a lens or mirror to produce a good image A change (usually undesired) in the waveform of an acoustic or analog electrical signal; the difference between two measurements of a signal (as between the input and output signal); "heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion" The act of distorting something so it seems to mean something it was not intended to mean The mistake of misrepresenting the facts The parallax of a celestial body using two points on the surface of the earth as the earth rotates Fluctuations that occur during each day A concave shape whose distinguishing characteristic is that the concavity faces downward Informal terms for a human head A stadium that has a roof A hemispherical roof Change in the apparent frequency of a wave as observer and source move toward or away from each other Mention something unpleasant from the past; "Drag up old stories" The act of applying force to propel something; "after reaching the desired velocity the drive is cut off" A mechanism by which force or power is transmitted in a machine; "a variable speed drive permitted operation through a range of speeds" A series of actions advancing a principle or tending toward a particular end; "he supported populist campaigns"; "they worked in the cause of world peace"; "the team was ready for a drive toward the pennant"; "the movement to end slavery"; "contributed to the war effort" A road leading up to a private house; "they parked in the driveway" The trait of being highly motivated; "his drive and energy exhausted his co-workers" Hitting a golf ball off of a tee with a driver; "he sliced his drive out of bounds" The act of driving a herd of animals overland A journey in a vehicle (usually an automobile); "he took the family for a drive in his new car" A physiological state corresponding to a strong need or desire (computer science) a device that writes data onto or reads data from a storage medium A wide scenic road planted with trees; "the riverside drive offers many exciting scenic views" (sports) a hard straight return (as in tennis or squash) Operate or control a vehicle; "drive a car or bus"; "Can you drive this four-wheel truck?" Travel or be transported in a vehicle; "We drove to the university every morning"; "They motored to London for the theater" Cause someone or something to move by driving; "She drove me to school every day"; "We drove the car to the garage" Force into or from an action or state, either physically or metaphorically; "She rammed her mind into focus"; "He drives me mad" To compel or force or urge relentlessly or exert coercive pressure on, or motivate strongly; "She is driven by her passion" Cause to move back by force or influence; "repel the enemy"; "push back the urge to smoke"; "beat back the invaders" Compel somebody to do something, often against his own will or judgment; "She finally drove him to change jobs" Push, propel, or press with force; "Drive a nail into the wall" Cause to move rapidly by striking or throwing with force; "drive the ball far out into the field" Strive and make an effort to reach a goal; "She tugged for years to make a decent living"; "We have to push a little to make the deadline!"; "She is driving away at her doctoral thesis" Move into a desired direction of discourse; "What are you driving at?" Have certain properties when driven; "This car rides smoothly"; "My new truck drives well" Work as a driver; "He drives a bread truck"; "She drives for the taxi company in Newark" Move by being propelled by a force; "The car drove around the corner" Urge forward; "drive the cows into the barn" Proceed along in a vehicle; "We drive the turnpike to work" Strike with a driver, as in teeing off; "drive a golf ball" Hit very hard, as by swinging a bat horizontally; "drive a ball" Excavate horizontally; "drive a tunnel" Cause to function by supplying the force or power for or by controlling; "The amplifier drives the tube"; "steam drives the engines"; "this device drives the disks for the computer" Hunting: search for game; "drive the forest" Hunting: chase from cover into more open ground; "drive the game" A cloud of dust suspended in the air Fine powdery material such as dry earth or pollen that can be blown about in the air; "the furniture was covered with dust" The remains of something that has been destroyed or broken up Free microscopic particles of solid material; "astronomers say that the empty space between planets actually contains measurable amounts of dust" Remove the dust from; "dust the cabinets" Rub the dust over a surface so as to blur the outlines of a shape; "The artist dusted the charcoal drawing down to a faint image" Cover with a light dusting of a substance; "dust the bread with flour" Distribute loosely; "He scattered gun powder under the wagon" A windstorm that lifts up clouds of dust or sand; "it was the kind of duster not experienced in years" The branch of mechanics concerned with the forces that cause motions of bodies The 3rd planet from the sun; the planet we live on; "the Earth moves around the sun"; "he sailed around the world" The loose soft material that makes up a large part of the land surface; "they dug into the earth outside the church" The solid part of the earth's surface; "the plane turned away from the sea and moved back over land"; "the earth shook for several minutes"; "he dropped the logs on the ground" The abode of mortals (as contrasted with Heaven or Hell); "it was hell on earth" The concerns of this life as distinguished from heaven and the afterlife; "they consider the church to be independent of the world" A connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage) Hide in the earth like a hunted animal Connect to the earth; "earth the circuit" Shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity A disturbance that is extremely disruptive; "selling the company caused an earthquake among the employees" Strange and unconventional behavior (geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis; "a circle is an ellipse with zero eccentricity" A circularity that has a different center or deviates from a circular path One celestial body obscures another Be greater in significance than; "the tragedy overshadowed the couple's happiness" Cause an eclipse of (a celestial body) by intervention; "The Sun eclipses the moon today"; "Planets and stars often are occulted by other celestial bodies" The great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator; "all of the planets rotate the sun in approximately the same ecliptic" A disk-shaped region of minor planets outside the orbit of Neptune The act of expelling or projecting or ejecting The act of forcing out someone or something; "the ejection of troublemakers by the police"; "the child's expulsion from school" The tendency of a body to return to its original shape after it has been stretched or compressed; "the waistband had lost its snap" A region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length The quantity of unbalanced electricity in a body (either positive or negative) and construed as an excess or deficiency of electrons; "the battery needed a fresh charge" A dipole with equal and opposite electric charges A field of force surrounding a charged particle A physical phenomenon associated with stationary or moving electrons and protons Energy made available by the flow of electric charge through a conductor; "they built a car that runs on electricity" Keen and shared excitement; "the stage crackled with electricity whenever she was on it" A conductor used to make electrical contact with some part of a circuit Pertaining to or exhibiting magnetism produced by electric charge in motion; "electromagnetic energy" An interaction between charged elementary particles that is intermediate in strength between the strong and weak interactions; mediated by photons Radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge A group of nearly parallel lines of electromagnetic radiation An elementary particle with negative charge Equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor) The branch of physics that deals with the emission and effects of electrons and with the use of electronic devices (physics) a particle that is less complex than an atom; regarded as constituents of all matter Spectrum of electromagnetic radiation emitted by a self-luminous source A minor short-term fight A casual or unexpected convergence; "he still remembers their meeting in Paris"; "there was a brief encounter in the hallway" A casual meeting with a person or thing A hostile disagreement face-to-face Come together; "I'll probably see you at the meeting"; "How nice to see you again!" Come upon, as if by accident; meet with; "We find this idea in Plato"; "I happened upon the most wonderful bakery not very far from here"; "She chanced upon an interesting book in the bookstore the other day" Be beset by; "The project ran into numerous financial difficulties" Experience as a reaction; "My proposal met with much opposition" Contend against an opponent in a sport, game, or battle; "Princeton plays Yale this weekend"; "Charlie likes to play Mary" (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms" Forceful exertion; "he plays tennis with great energy"; "he's full of zip" Enterprising or ambitious drive; "Europeans often laugh at American energy" An imaginative lively style (especially style of writing); "his writing conveys great energy"; "a remarkable muscularity of style" A healthy capacity for vigorous activity; "jogging works off my excess energy"; "he seemed full of vim and vigor" Any source of usable power; "the DOE is responsible for maintaining the energy policy" The federal department responsible for maintaining a national energy policy of the United States; created in 1977 A definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules; "according to quantum theory only certain energy levels are possible" The practical application of science to commerce or industry The discipline dealing with the art or science of applying scientific knowledge to practical problems; "he had trouble deciding which branch of engineering to study" A room (as on a ship) in which the engine is located Act of making fuller or more meaningful or rewarding A gift that significantly increases the recipient's wealth (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; "enthalpy is the amount of energy in a system capable of doing mechanical work" (communication theory) a numerical measure of the uncertainty of an outcome; "the signal contained thousands of bits of information" (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work; "entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity" A flat (usually rectangular) container for a letter, thin package, etc. Any wrapper or covering A curve that is tangent to each of a family of curves A natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet" The maximum operating capability of a system (especially an aircraft); "test pilots try to push the envelope" The bag containing the gas in a balloon An annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year; "today computers calculate the ephemerides" (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions A period marked by distinctive character or reckoned from a fixed point or event (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded A unit of geological time that is a subdivision of a period and is itself divided into ages An imaginary line around the Earth forming the great circle that is equidistant from the north and south poles; "the equator is the boundary between the northern and southern hemispheres" A circle dividing a sphere or other surface into two usually equal and symmetrical parts A stable situation in which forces cancel one another A chemical reaction and its reverse proceed at equal rates Equality of distribution A sensory system located in structures of the inner ear that registers the orientation of the head Either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic A wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults" Inadvertent incorrectness A misconception resulting from incorrect information (baseball) a failure of a defensive player to make an out when normal play would have sufficed Departure from what is ethically acceptable (computer science) the occurrence of an incorrect result produced by a computer Part of a statement that is not correct; "the book was full of errors" The sudden occurrence of a violent discharge of steam and volcanic material Symptom consisting of a breaking out and becoming visible (of volcanos) pouring out fumes or lava (or a deposit so formed) A sudden violent spontaneous occurrence (usually of some undesirable condition); "the outbreak of hostilities" A sudden very loud noise The emergence of a tooth as it breaks through the gum The minimum velocity needed to escape a gravitational field A colorless odorless alkane gas used as fuel A flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic The process of becoming a vapor The process of extracting moisture A process in which something passes by degrees to a different stage (especially a more advanced or mature stage); "the development of his ideas took many years"; "the evolution of Greek civilization"; "the slow development of her skill as a writer" (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms The state of being emotionally aroused and worked up; "his face was flushed with excitement and his hands trembled"; "he tried to calm those who were in a state of extreme inflammation" The neural or electrical arousal of an organ or muscle or gland Something that agitates and arouses; "he looked forward to the excitements of the day" The outermost atmospheric layer The act of increasing (something) in size or volume or quantity or scope A function expressed as a sum or product of terms; "the expansion of (a+b)^2 is a^2 + 2ab + b^2" A discussion that provides additional information Adding information or detail A violent release of energy caused by a chemical or nuclear reaction A sudden great increase; "the population explosion"; "the information explosion" The noise caused by an explosion; "the explosion was heard a mile away" The terminal forced release of pressure built up during the occlusive phase of a stop consonant A sudden outburst; "an explosion of laughter"; "an explosion of rage" A golf shot from a bunker that typically moves sand as well as the golf ball Combination of lenses at the viewing end of optical instruments A bright spot on a planet A large bright spot on the sun's photosphere occurring most frequently in the vicinity of sunspots Food for domestic livestock Provide as food; "Feed the guests the nuts" Give food to; "Feed the starving children in India"; "don't give the child this tough meat" Feed into; supply; "Her success feeds her vanity" Introduce continuously; "feed carrots into a food processor" Support or promote; "His admiration fed her vanity" Take in food; used of animals only; "This dog doesn't eat certain kinds of meat"; "What do whales eat?" Serve as food for; be the food for; "This dish feeds six" Move along, of liquids; "Water flowed into the cave"; "the Missouri feeds into the Mississippi" Profit from in an exploitatory manner; "He feeds on her insecurity" Gratify; "feed one's eyes on a gorgeous view" Provide with fertilizers or add nutrients to; "We should fertilize soil if we want to grow healthy plants" (physics) law obeyed by a systems of particles whose wave function changes when two particles are interchanged (the Pauli exclusion principle applies) Any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle The transmission of light signals via glass fibers The area that is visible (as through an optical instrument) Problem solving that involves numbers or quantities Device that removes something from whatever passes through it An electrical device that alters the frequency spectrum of signals passing through it Remove by passing through a filter; "filter out the impurities" Pass through; "Water permeates sand easily" Run or flow slowly, as in drops or in an unsteady stream; "water trickled onto the lawn from the broken hose"; "reports began to dribble in" The presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements; "the fine structure results from slightly different energy levels" A highly energetic and indefatigable person A ball of fire (such as the sun or a ball-shaped discharge of lightning) The luminous center of a nuclear explosion Reproduction of some unicellular organisms by division of the cell into two more or less equal parts A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy A shape that spreads outward; "the skirt had a wide flare" A sudden burst of flame A burst of light used to communicate or illuminate Reddening of the skin spreading outward from a focus of infection or irritation A sudden recurrence or worsening of symptoms; "a colitis flare"; "infection can cause a lupus flare" A sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference Am unwanted reflection in an optical system (or the fogging of an image that is caused by such a reflection) A sudden outburst of emotion; "she felt a flare of delight"; "she could not control her flare of rage" A device that produces a bright light for warning or illumination or identification A short forward pass to a back who is running toward the sidelines; "he threw a flare to the fullback who was tackled for a loss" (baseball) a fly ball hit a short distance into the outfield Burn brightly; "Every star seemed to flare with new intensity" Become flared and widen, usually at one end; "The bellbottom pants flare out" Shine with a sudden light; "The night sky flared with the massive bombardment" Erupt or intensify suddenly; "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism" A red dwarf star in which luminosity can change several magnitudes in a few minutes The highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission The state of being flexed (as of a joint) An angular or rounded shape made by folding; "a fold in the napkin"; "a crease in his trousers"; "a plication on her blouse"; "a flexure of the colon"; "a bend of his elbow" Act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased The motion characteristic of fluids (liquids or gases) The amount of fluid that flows in a given time The act of flowing or streaming; continuous progression Any uninterrupted stream or discharge Something that resembles a flowing stream in moving continuously; "a stream of people emptied from the terminal"; "the museum had planned carefully for the flow of visitors" The monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle Move or progress freely as if in a stream; "The crowd flowed out of the stadium" Cause to flow; "The artist flowed the washes on the paper" Be abundantly present; "The champagne flowed at the wedding" Fall or flow in a certain way; "This dress hangs well"; "Her long black hair flowed down her back" Cover or swamp with water Undergo menstruation; "She started menstruating at the age of 11" A wave motion; "the fluctuations of the sea" An instance of change; the rate or magnitude of change The quality of being unsteady and subject to changes; "he kept a record of price fluctuations" Study of the mechanics of fluids Light emitted during absorption of radiation of some other (invisible) wavelength (physics) the number of changes in energy flow across a given surface per unit area The rate of flow of energy or particles across a given surface A flow or discharge A substance added to molten metals to bond with impurities that can then be readily removed Excessive discharge of liquid from a cavity or organ (as in watery diarrhea) A state of uncertainty about what should be done (usually following some important event) preceding the establishment of a new direction of action; "the flux following the death of the emperor" The lines of force surrounding a permanent magnet or a moving charged particle In constant change; "his opinions are in flux"; "the newness and flux of the computer industry" Become liquid or fluid when heated; "the frozen fat liquefied" Mix together different elements; "The colors blend well" The distance from a lens to its focus The concentration of attention or energy on something; "the focus of activity shifted to molecular biology"; "he had no direction in his life" Maximum clarity or distinctness of an image rendered by an optical system; "in focus"; "out of focus" Maximum clarity or distinctness of an idea; "the controversy brought clearly into focus an important difference of opinion" A central point or locus of an infection in an organism; "the focus of infection" Special emphasis attached to something; "the stress was more on accuracy than on speed" A point of convergence of light (or other radiation) or a point from which it diverges A fixed reference point on the concave side of a conic section Cause to converge on or toward a central point; "Focus the light on this image" Bring into focus or alignment; to converge or cause to converge; of ideas or emotions Become focussed or come into focus; "The light focused" Put (an image) into focus; "Please focus the image; we cannot enjoy the movie" A powerful effect or influence; "the force of his eloquence easily persuaded them" (physics) the influence that produces a change in a physical quantity; "force equals mass times acceleration" Physical energy or intensity; "he hit with all the force he could muster"; "it was destroyed by the strength of the gale"; "a government has not the vitality and forcefulness of a living man" Group of people willing to obey orders; "a public force is necessary to give security to the rights of citizens" A unit that is part of some military service; "he sent Caesar a force of six thousand men" An act of aggression (as one against a person who resists); "he may accomplish by craft in the long run what he cannot do by force and violence in the short one" One possessing or exercising power or influence or authority; "the mysterious presence of an evil power"; "may the force be with you"; "the forces of evil" A group of people having the power of effective action; "he joined forces with a band of adventurers" (of a law) having legal validity; "the law is still in effect" A putout of a base runner who is required to run; the putout is accomplished by holding the ball while touching the base to which the runner must advance before the runner reaches that base; "the shortstop got the runner at second on a force" To cause to do through pressure or necessity, by physical, moral or intellectual means :"She forced him to take a job in the city"; "He squeezed her for information" Urge or force (a person) to an action; constrain or motivate Move with force, "He pushed the table into a corner" Impose urgently, importunately, or inexorably; "She forced her diet fads on him" Squeeze like a wedge into a tight space; "I squeezed myself into the corner" Cause to move by pulling; "draw a wagon"; "pull a sled" Do forcibly; exert force; "Don't force it!" Take by force; "Storm the fort" An arrangement of people or things acting as a unit; "a defensive formation"; "a formation of planes" The act of fabricating something in a particular shape The act of forming or establishing something; "the constitution of a PTA group last year"; "it was the establishment of his reputation"; "he still remembers the organization of the club" (geology) the geological features of the earth A particular spatial arrangement Natural process that causes something to form; "the formation of gas in the intestine"; "the formation of crystals"; "the formation of pseudopods" Creation by mental activity; "the formation of sentences"; "the formation of memories" Analysis of a periodic function into a sum of simple sinusoidal components Separating something into fine particles The disintegration of social norms governing behavior and thought and social relationships (computer science) the condition of a file that is broken up and stored in many different locations on a magnetic disk; "fragmentation slows system performance because it takes extra time to locate and assemble the parts of the fragmented file" The scattering of bomb fragments after the bomb explodes A piece broken off or cut off of something else; "a fragment of rock" A broken piece of a brittle artifact An incomplete piece; "fragments of a play" Break or cause to break into pieces; "The plate fragmented" A distribution of observed frequencies of occurrence of the values of a variable The number of occurrences within a given time period; "the frequency of modulation was 40 cycles per second"; "the frequency of his seizures increased as he grew older" The ratio of the number of observations in a statistical category to the total number of observations The number of observations in a given statistical category A state of conflict between persons The resistance encountered when one body is moved in contact with another Effort expended in moving one object over another with pressure (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function) What something is used for; "the function of an auger is to bore holes"; "ballet is beautiful but what use is it?" The actions and activities assigned to or required or expected of a person or group; "the function of a teacher"; "the government must do its part"; "play its role" A relation such that one thing is dependent on another; "height is a function of age"; "price is a function of supply and demand" A formal or official social gathering or ceremony; "it was a black-tie function" A vaguely specified social event; "the party was quite an affair"; "an occasion arranged to honor the president"; "a seemingly endless round of social functions" A set sequence of steps, part of larger computer program Perform as expected when applied; "The washing machine won't go unless it's plugged in"; "Does this old car still run well?"; "This old radio doesn't work anymore" Serve a purpose, role, or function; "The tree stump serves as a table"; "The female students served as a control group"; "This table would serve very well"; "His freedom served him well"; "The table functions as a desk" Perform duties attached to a particular office or place or function; "His wife officiated as his private secretary" The lowest tone of a harmonic series An occurrence that involves the production of a union The state of being combined into one body The merging of adjacent sounds or syllables or words A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy The combining of images from the two eyes to form a single visual percept Correction of an unstable part of the spine by joining two or more vertebrae; usually done surgically but sometimes done by traction or immobilization The act of fusing (or melting) together Of or relating to a galaxy (especially our galaxy the Milky Way); "the galactic plane" Inconceivably large A splendid assemblage (especially of famous people) Tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula' is a former name for `galaxy'" One of the four satellites of Jupiter that were discovered by Galileo The state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely A volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines A state of excessive gas in the alimentary canal A pedal that controls the throttle valve; "he stepped on the gas" A fossil fuel in the gaseous state; used for cooking and heating homes Attack with gas; subject to gas fumes; "The despot gassed the rebellious tribes" Show off A faint spot of light in the night sky that appears directly opposite the position of the sun; a reflection of sunlight by micrometeoric material in space A generalization of special relativity to include gravity (based on the principle of equivalence) The branch of geology that studies the shape of the earth and the determination of the exact position of geographical points A science that deals with the history of the earth as recorded in rocks Geology that uses physical principles to study properties of the earth A very bright star of large diameter and low density (relative to the Sun) A brittle transparent solid with irregular atomic structure A container for holding liquids while drinking The quantity a glass will hold A small refracting telescope An amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant A mirror; usually a ladies' dressing mirror Glassware collectively; "She collected old glass" Furnish with glass; "glass the windows" Scan (game in the forest) with binoculars Enclose with glass; "glass in a porch" Put in a glass container Become glassy or take on a glass-like appearance; "Her eyes glaze over when she is bored" A navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver A small globe or ball A relatively small granular particle of a substance; "a grain of sand"; "a grain of sugar" Foodstuff prepared from the starchy grains of cereal grasses The side of leather from which the hair has been removed A weight unit used for pearls or diamonds: 50 mg or 1/4 carat 1/60 dram; equals an avoirdupois grain or 64.799 milligrams 1/7000 pound; equals a troy grain or 64.799 milligrams Dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn A cereal grass; "wheat is a grain that is grown in Kansas" The smallest possible unit of anything; "there was a grain of truth in what he said"; "he does not have a grain of sense" The direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric; "saw the board across the grain" The physical composition of something (especially with respect to the size and shape of the small constituents of a substance); "breadfruit has the same texture as bread"; "sand of a fine grain"; "fish with a delicate flavor and texture"; "a stone of coarse grain" Thoroughly work in; "His hands were grained with dirt" Paint (a surface) to make it look like stone or wood Form into grains Become granular New connective tissue and tiny blood vessels that form on the surfaces of a wound during the healing process The act of forming something into granules or grains; "the granulation of medicines" A tiny grain A visual representation of the relations between certain quantities plotted with reference to a set of axes Represent by means of a graph; "chart the data" Plot upon a graph Used as a lubricant and as a moderator in nuclear reactors A network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument The measurement of specific gravity The implosion of a star resulting from its own gravity; the result is a smaller and denser celestial object A field of force surrounding a body of finite mass (physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface; "the more remote the body the less the gravity"; "the gravitation between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them"; "gravitation cannot be held responsible for people falling in love"--Albert Einstein A weak interaction between particles that results from their mass; mediated by gravitons Movement downward resulting from gravitational attraction; "irrigation by gravitation rather than by pumps" A figurative movement toward some attraction; "the gravitation of the middle class to the suburbs" A gauge boson that mediates the (extremely weak) gravitational interactions between particles A manner that is serious and solemn A solemn and dignified feeling (physics) a wave that is hypothesized to propagate gravity and to travel at the speed of light A massive grouping of galaxies in the direction of Centaurus and Hydra whose gravitational attraction is believed to cause deviations in the paths of other galaxies Warming that results when solar radiation is trapped by the atmosphere; caused by atmospheric gases that allow sunshine to pass through but absorb heat that is radiated back from the warmed surface of the earth The solar calendar now in general use, introduced by Gregory XIII in 1582 to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752 A reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror A pattern of regularly spaced horizontal and vertical lines A system of high tension cables by which electrical power is distributed throughout a region A perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material An electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube A cooking utensil of parallel metal bars; used to grill fish or meat Any elementary particle that interacts strongly with other particles An indication of radiant light drawn around the head of a saint A toroidal shape; "a ring of ships in the harbor"; "a halo of smoke" A circle of light around the sun or moon An apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on Signal by means of a mirror and the using the sun's rays An instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope The boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet The region inside the heliopause containing the sun and solar system Combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two Of or relating to the beat produced by heterodyning two oscillations The line at which the sky and Earth appear to meet The range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge" A specific layer or stratum of soil or subsoil in a vertical cross section of land The great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth The maximum parallax observed when the celestial body is at the horizon The angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer An organic compound containing only carbon and hydrogen Study of fluids in motion The monovalent group -OH in such compounds as bases and some acids and alcohols The act of designating or identifying something Evidence of identity; something that identifies a person or thing The condition of having the identity (of a person or object) established; "the thief's identification was followed quickly by his arrest"; "identification of the gun was an important clue" The process of recognizing something or someone by remembering; "a politician whose recall of names was as remarkable as his recognition of faces"; "experimental psychologists measure the elapsed time from the onset of the stimulus to its recognition by the observer" The attribution to yourself (consciously or unconsciously) of the characteristics of another person (or group of persons) A condition of spiritual awareness; divine illumination; "follow God's light" The degree of visibility of your environment An interpretation that removes obstacles to understanding; "the professor's clarification helped her to understand the textbook" The luminous flux incident on a unit area Painting or drawing included in a book (especially in illuminated medieval manuscripts) An iconic mental representation; "her imagination forced images upon her too awful to contemplate" (Jungian psychology) a personal facade that one presents to the world; "a public image is as fragile as Humpty Dumpty" A visual representation (of an object or scene or person or abstraction) produced on a surface; "they showed us the pictures of their wedding"; "a movie is a series of images projected so rapidly that the eye integrates them" A standard or typical example; "he is the prototype of good breeding"; "he provided America with an image of the good father" Language used in a figurative or nonliteral sense Someone who closely resembles a famous person (especially an actor); "he could be Gingrich's double"; "she's the very image of her mother" (mathematics) the set of values of the dependent variable for which a function is defined; "the image of f(x) = x^2 is the set of all non-negative real numbers if the domain of the function is the set of all real numbers" The general impression that something (a person or organization or product) presents to the public; "although her popular image was contrived it served to inspire music and pageantry"; "the company tried to project an altruistic image" A representation of a person (especially in the form of sculpture); "the coin bears an effigy of Lincoln"; "the emperor's tomb had his image carved in stone" Render visible, as by means of MRI Imagine; conceive of; see in one's mind; "I can't see him on horseback!"; "I can see what will happen"; "I can see a risk in this strategy" An attitude of mind especially one that favors one alternative over others; "he had an inclination to give up too easily"; "a tendency to be too strict" (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees (geometry) the angle formed by the x-axis and a given line (measured counterclockwise from the positive half of the x-axis) (physics) the angle that a magnetic needle makes with the plane of the horizon That toward which you are inclined to feel a liking; "her inclination is for classical music" The property possessed by a line or surface that departs from the vertical; "the tower had a pronounced tilt"; "the ship developed a list to starboard"; "he walked with a heavy inclination to the right" A characteristic likelihood of or natural disposition toward a certain condition or character or effect; "the alkaline inclination of the local waters"; "fabric with a tendency to shrink" The act of inclining; bending forward; "an inclination of his head indicated his agreement" A coordinate system in which Newton's first law of motion is valid Electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves The infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range; "they could sense radiation in the infrared" Having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end; "infrared radiation"; "infrared photography" An unstable order Unreliability attributable to being unstable A lack of balance or state of disequilibrium; "a hormonal imbalance" The quality or attribute of being unstable and irresolute A device that requires skill for proper use The means whereby some act is accomplished; "my greed was the instrument of my destruction"; "science has given us new tools to fight disease" A person used by another to gain an end (law) a document that states some contractual relationship or grants some right The semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process Any of various devices or contrivances that can be used to produce musical tones or sounds Equip with instruments for measuring, recording, or controlling Write an instrumental score for Address a legal document to The amount of energy transmitted (as by acoustic or electromagnetic radiation); "he adjusted the intensity of the sound"; "they measured the station's signal strength" High level or degree; the property of being intense The magnitude of sound (usually in a specified direction); "the kids played their music at full volume" Chromatic purity: freedom from dilution with white and hence vivid in hue A mutual or reciprocal action; interacting (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons One of the light or dark bands produced by the interference and diffraction of light Any measuring instrument that uses interference patterns to make accurate measurements of waves The space between galaxies; "the Milky Way travels through intergalactic space" The region that is inside of something The inner or enclosed surface of something The United States federal department charged with conservation and the development of natural resources; created in 1849 Situated within or suitable for inside a building; "an interior scene"; "interior decoration"; "an interior bathroom without windows" Inside the country; "the British Home Office has broader responsibilities than the United States Department of the Interior"; "the nation's internal politics" Located inward; "Beethoven's manuscript looks like a bloody record of a tremendous inner battle"- Leonard Bernstein; "she thinks she has no soul, no interior life, but the truth is that she has no access to it"- David Denby; "an internal sense of rightousness"- A.R.Gurney,Jr. Inside and toward a center; "interior regions of the earth" Of or coming from the middle of a region or country; "upcountry districts" Microscopic particles in the interplanetary medium A rarefied flow of gas and charged particles (plasma) that stream from the sun and form the solar wind A particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons The condition of being dissociated into ions (as by heat or radiation or chemical reaction or electrical discharge); "the ionization of a gas" The process of ionizing; the formation of ions by separating atoms or molecules or radicals or by adding or subtracting electrons from atoms by strong electric fields in a gas The outer region of the Earth's atmosphere; contains a high concentration of free electrons One of two or more atoms with the same atomic number but with different numbers of neutrons (physics) the property of being isotropic; having the same value when measured in different directions An airplane powered by one or more jet engines The occurrence of a sudden discharge (as of liquid) A hard black form of lignite that takes a brilliant polish and is used in jewelry or ornamentation Atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward Street names for ketamine An artificially produced flow of water Issue in a jet; come out in a jet; stream or spring forth; "Water jetted forth"; "flames were jetting out of the building" Fly a jet plane Of the blackest black; similar to the color of jet or coal Any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter) The solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February The largest planet and the 5th from the sun; has many satellites and is one of the brightest objects in the night sky (Roman mythology) supreme god of Romans; counterpart of Greek Zeus The basic unit of thermodynamic temperature adopted under the Systeme International d'Unites British physicist who invented the Kelvin scale of temperature and pioneered undersea telegraphy (1824-1907) The branch of mechanics concerned with motion without reference to force or mass The mechanical energy that a body has by virtue of its motion An artificial source of visible illumination A piece of furniture holding one or more electric light bulbs The larger of the two Magellanic Clouds visible from the southern hemisphere An acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light The angular distance between an imaginary line around a heavenly body parallel to its equator and the equator itself Freedom from normal restraints in conduct; "the new freedom in movies and novels"; "allowed his children considerable latitude in how they spent their money" An imaginary line around the Earth parallel to the equator Scope for freedom of e.g. action or thought; freedom from restriction A transparent optical device used to converge or diverge transmitted light and to form images Genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils (metaphor) a channel through which something can be seen or understood; "the writer is the lens through which history can be seen" Biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses light on the retina Electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons 100 lepta equal 1 drachma in Greece An elementary particle that participates in weak interactions; has a baryon number of 0 (astronomy) a real or apparent slow oscillation of a moon or satellite; "the libration of the moon" A characteristic state or mode of living; "social life"; "city life"; "real life" The experience of being alive; the course of human events and activities; "he could no longer cope with the complexities of life" The course of existence of an individual; the actions and events that occur in living; "he hoped for a new life in Australia"; "he wanted to live his own life without interference from others" The condition of living or the state of being alive; "while there's life there's hope"; "life depends on many chemical and physical processes" The period during which something is functional (as between birth and death); "the battery had a short life"; "he lived a long and happy life" The period between birth and the present time; "I have known him all his life" The period from the present until death; "he appointed himself emperor for life" A living person; "his heroism saved a life" Animation and energy in action or expression; "it was a heavy play and the actors tried in vain to give life to it" Living things collectively; "the oceans are teeming with life" The organic phenomenon that distinguishes living organisms from nonliving ones; "there is no life on the moon" An account of the series of events making up a person's life A motive for living; "pottery was his life" A prison term lasting as long as the prisoner lives; "he got life for killing the guard" The distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers A spectrum in which energy is concentrated at particular wavelengths; produced by excited atoms and ions as they fall back to a lower energy level The solid part of the earth consisting of the crust and outer mantle (anatomy) a somewhat rounded subdivision of a bodily organ or part; "ear lobe" (botany) a part into which a leaf is divided The enhanced response of an antenna in a given direction as indicated by a loop in its radiation pattern A rounded projection that is part of a larger structure The angular distance between a point on any meridian and the prime meridian at Greenwich Fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines Anything with a round or oval shape (formed by a curve that is closed and does not intersect itself) (computer science) a single execution of a set of instructions that are to be repeated; "the solution took hundreds of iterations" An inner circle of advisors (especially under President Reagan); "he's no longer in the loop" The basic pattern of the human fingerprint A computer program that performs a series of instructions repeatedly until some specified condition is satisfied The topology of a network whose components are serially connected in such a way that the last component is connected to the first component An intrauterine device in the shape of a loop A complete electrical circuit around which current flows or a signal circulates A flight maneuver; aircraft flies a complete circle in the vertical plane Move in loops; "The bicycle looped around the tree" Make a loop in; "loop a rope" Fly loops, perform a loop; "the stunt pilot looped his plane" Wind around something in coils or loops Fasten or join with a loop; "He looped the watch through his belt" Light not due to incandescence; occurs at low temperatures Light from nonthermal sources The earth interrupts light shining on the moon Of or relating to or associated with the moon; "lunar surface"; "lunar module" A time when the Moon presents a particular recurring appearance Either of two small galaxies orbiting the Milky Way; visible near the south celestial pole A hypothetical particle with a single magnetic pole instead of the usual two Either of two points where the lines of force of the Earth's magnetic field are vertical One of the two ends of a magnet where the magnetism seems to be concentrated A sudden disturbance of the earth's magnetic field; caused by emission of particles from the sun A scientific instrument that registers magnetic variations (especially variations of the earth's magnetic field) The study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal) The magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field The property of relative size or extent (whether large or small); "they tried to predict the magnitude of the explosion"; "about the magnitude of a small pea" A number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10 Relative importance; "a problem of the first magnitude" The longest axis of an ellipse or ellipsoid; passes through the two foci Reflecting telescope in which the aberration of the concave mirror is reduced by a meniscus lens The cloak as a symbol of authority; "place the mantle of authority on younger shoulders" United States baseball player (1931-1997) The layer of the earth between the crust and the core Anything that covers; "there was a blanket of snow" (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell Shelf that projects from wall above fireplace; "in Britain they call a mantel a chimneypiece" Hanging cloth used as a blind (especially for a window) A sleeveless garment like a cloak but shorter Spread over a surface, like a mantle Cover like a mantle; "The ivy mantles the building" A diagrammatic representation of the earth's surface (or part of it) Make a map of; show or establish the features of details of; "map the surface of Venus" Explore or survey for the purpose of making a map; "We haven't even begun to map the many galaxies that we know exist" Locate within a specific region of a chromosome in relation to known DNA or gene sequences; "map the genes" Plan, delineate, or arrange in detail; "map one's future" Depict as if on a map; "sorrow was mapped on the mother's face" To establish a mapping (of mathematical elements or sets) A dark region of considerable extent on the surface of the moon Valuable timber tree of Panama A small reddish planet that is the 4th from the sun and is periodically visible to the naked eye; minerals rich in iron cover its surface and are responsible for its characteristic color; "Mars has two satellites" (Roman mythology) Roman god of war and agriculture; father of Romulus and Remus; counterpart of Greek Ares An acronym for microwave amplification by stimulated emission of radiation; an amplifier that works on the same principle as a laser and emits coherent microwave radiation The property of a body that causes it to have weight in a gravitational field (often followed by `of') a large number or amount or extent; "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "see the rest of the winners in our huge passel of photos"; "it must have cost plenty"; "a slew of journalists"; "a wad of money" An ill-structured collection of similar things (objects or people) (Roman Catholic Church and Protestant Churches) the celebration of the Eucharist A body of matter without definite shape; "a huge ice mass" The common people generally; "separate the warriors from the mass"; "power to the people" The property of something that is great in magnitude; "it is cheaper to buy it in bulk"; "he received a mass of correspondence"; "the volume of exports" A musical setting for a Mass; "they played a Mass composed by Beethoven" A sequence of prayers constituting the Christian Eucharistic rite; "the priest said Mass" Join together into a mass or collect or form a mass; "Crowds were massing outside the palace" Formed of separate units gathered into a mass or whole; "aggregate expenses include expenses of all divisions combined for the entire year"; "the aggregated amount of indebtedness" A science (or group of related sciences) dealing with the logic of quantity and shape and arrangement A vaguely specified concern; "several matters to attend to"; "it is none of your affair"; "things are going well" Some situation or event that is thought about; "he kept drifting off the topic"; "he had been thinking about the subject for several years"; "it is a matter for the police" That which has mass and occupies space; "physicists study both the nature of matter and the forces which govern it" A problem; "is anything the matter?" (used with negation) having consequence; "they were friends and it was no matter who won the games" Written works (especially in books or magazines); "he always took some reading matter with him on the plane" Have weight; have import, carry weight; "It does not matter much" The largest possible quantity The greatest possible degree; "he tried his utmost" The point on a curve where the tangent changes from positive on the left to negative on the right The greatest or most complete or best possible; "maximal expansion"; "maximum pressure" (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator) The act or process of assigning numbers to phenomena according to a rule; "the measurements were carefully done"; "his mental measurings proved remarkably accurate" Instrument that shows the extent or amount or quantity or degree of something The combination of two or more commercial companies The highest level or degree attainable; the highest stage of development; "his landscapes were deemed the acme of beauty"; "the artist's gifts are at their acme"; "at the height of her career"; "the peak of perfection"; "summer was at its peak"; "...catapulted Einstein to the pinnacle of fame"; "the summit of his ambition"; "so many highest superlatives achieved by man"; "at the top of his profession" A town in eastern Mississippi An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude" Of or happening at noon; "meridian hour" Being at the best stage of development; "our manhood's prime vigor"- Robert Browning An elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 The atmospheric layer between the stratosphere and the thermosphere Stony or metallic object that is the remains of a meteoroid that has reached the earth's surface (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere A streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode Predicting what the weather will be The earth science dealing with phenomena of the atmosphere (especially weather) A transient shower of meteors when a meteor swarm enters the earth's atmosphere The scientific study of measurement A meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere A metric unit of length equal to one millionth of a meter Caliper for measuring small distances Special kind of densitometer that measures density variations over a very small area Integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system; "a microprocessor functions as the central processing unit of a microcomputer"; "a disk drive contains a microprocessor to handle the internal functions of the drive" A short electromagnetic wave (longer than infrared but shorter than radio waves); used for radar and microwave ovens and for transmitting telephone, facsimile, video and data Kitchen appliance that cooks food by passing an electromagnetic wave through it; heat results from the absorption of energy by the water molecules in the food Cook or heat in a microwave oven; "You can microwave the leftovers" The use of spectroscopy to study atomic or molecular resonances in the microwave spectrum The part of the electromagnetic spectrum corresponding to microwaves The branch of geology that studies minerals: their structure and properties and the ways of distinguishing them The smallest possible quantity The point on a curve where the tangent changes from negative on the left to positive on the right The least possible; "needed to enforce minimal standards"; "her grades were minimal"; "minimum wage"; "a minimal charge for the service" The shorter or shortest axis of an ellipse or ellipsoid Polished surface that forms images by reflecting light A faithful depiction or reflection; "the best mirror is an old friend" Reflect as if in a mirror; "The smallest pond at night mirrors the firmament above" Reflect or resemble; "The plane crash in Milan mirrored the attack in the World Trade Center" A hypothetical description of a complex entity or process; "the computer program was based on a model of the circulatory and respiratory systems" A type of product; "his car was an old model" A person who poses for a photographer or painter or sculptor; "the president didn't have time to be a model so the artist worked from photos" Representation of something (sometimes on a smaller scale) Something to be imitated; "an exemplar of success"; "a model of clarity"; "he is the very model of a modern major general" Someone worthy of imitation; "every child needs a role model" A representative form or pattern; "I profited from his example" A woman who wears clothes to display fashions; "she was too fat to be a mannequin" The act of representing something (usually on a smaller scale) Plan or create according to a model or models Form in clay, wax, etc; "model a head with clay" Assume a posture as for artistic purposes; "We don't know the woman who posed for Leonardo so often" Display (clothes) as a mannequin; "model the latest fashion" Create a representation or model of; "The pilots are trained in conditions simulating high-altitude flights" Construct a model of; "model an airplane" Worthy of imitation; "exemplary behavior"; "model citizens" A musical passage moving from one key to another (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase Rise and fall of the voice pitch A manner of speaking in which the loudness or pitch or tone of the voice is modified The act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect) (physics and chemistry) the simplest structural unit of an element or compound An impelling force or strength; "the car's momentum carried it off the road" The product of a body's mass and its velocity; "the momentum of the particles was deduced from meteoritic velocities" The natural satellite of the Earth; "the average distance to the Moon is 384,400 kilometers"; "men first stepped on the moon in 1969" Any object resembling a moon; "he made a moon lamp that he used as a night light"; "the clock had a moon that showed various phases" The period between successive new moons (29.531 days) The light of the Moon; "moonlight is the smuggler's enemy"; "the Moon was bright enough to read by" United States religious leader (born in Korea) who founded the Unification Church in 1954; was found guilty of conspiracy to evade taxes (born in 1920) Any natural satellite of a planet; "Jupiter has sixteen moons" Have dreamlike musings or fantasies while awake; "She looked out the window, daydreaming" Be idle in a listless or dreamy way Expose one's buttocks to; "moon the audience" The branch of biology that deals with the structure of animals and plants Studies of the rules for forming admissible words The admissible arrangement of sounds in words The branch of geology that studies the characteristics and configuration and evolution of rocks and land forms The use of movements (especially of the hands) to communicate familiar or prearranged signals A natural event that involves a change in the position or location of something A change of position that does not entail a change of location; "the reflex motion of his eyebrows revealed his surprise"; "movement is a sign of life"; "an impatient move of his hand"; "gastrointestinal motility" A state of change; "they were in a state of steady motion" A formal proposal for action made to a deliberative assembly for discussion and vote; "he made a motion to adjourn"; "she called for the question" The act of changing location from one place to another; "police controlled the motion of the crowd"; "the movement of people from the farms to the cities"; "his move put him directly in my path" An optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object; "the cinema relies on apparent motion"; "the succession of flashing lights gave an illusion of movement" Show, express or direct through movement; "He gestured his desire to leave" An irregular arrangement of patches of color; "it was not dull grey as distance had suggested, but a mottle of khaki and black and olive-green" Mark with spots or blotches of different color or shades of color as if stained A system of three or more stars associated by gravity An elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino An extreme state of adversity; the lowest point of anything The point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected A medicinal liquid preparation intended for use in an atomizer Cloudiness of the urine An immense cloud of gas (mainly hydrogen) and dust in interstellar space (pathology) a faint cloudy spot on the cornea A surrounding or nearby region; "the plane crashed in the vicinity of Asheville"; "it is a rugged locality"; "he always blames someone else in the immediate neighborhood"; "I will drop in on you the next time I am in this neck of the woods" People living near one another; "it is a friendly neighborhood"; "my neighborhood voted for Bush" The approximate amount of something (usually used prepositionally as in `in the region of'); "it was going to take in the region of two or three months to finish the job"; "the price is in the neighborhood of $100" An area within a city or town that has some distinctive features (especially one forming a community); "an ethnic neighborhood" (Roman mythology) god of the sea; counterpart of Greek Poseidon A giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants; "the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846" An elementary particle with zero charge and zero mass An elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus A star that has collapsed under its own gravity; it is composed of neutrons Reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis The ability to see in reduced illumination (as in moonlight) A connecting point at which several lines come together Any thickened enlargement (botany) the small swelling that is the part of a plant stem from which one or more leaves emerge (physics) the point of minimum displacement in a periodic system (astronomy) a point where an orbit crosses a plane The source of lymph and lymphocytes Any bulge or swelling of an anatomical structure or part (computer science) any computer that is hooked up to a computer network Sound of any kind (especially unintelligible or dissonant sound); "he enjoyed the street noises"; "they heard indistinct noises of people talking"; "during the firework display that ended the gala the noise reached 98 decibels" The auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience; "modern music is just noise to me" Electrical or acoustic activity that can disturb communication A loud outcry of protest or complaint; "the announcement of the election recount caused a lot of noise"; "whatever it was he didn't like it and he was going to let them know by making as loud a noise as he could" Incomprehensibility resulting from irrelevant information or meaningless facts or remarks; "all the noise in his speech concealed the fact that he didn't have anything to say" The quality of lacking any predictable order or plan Emit a noise A system of words used to name things in a particular discipline; "legal terminology"; "biological nomenclature"; "the language of sociology" The celestial pole above the northern hemisphere; near Polaris The hemisphere that is to the north of the equator A star that ejects some of its material in the form of a cloud and become more luminous in the process (physics) a process that alters the energy or structure or composition of atomic nuclei (astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom (mathematics) the branch of mathematics that studies algorithms for approximating solutions to problems in the infinitesimal calculus Uncontrolled nodding The property possessed by a round shape that is flattened at the poles; "the oblateness of the planet" The act of making and recording a measurement The act of observing; taking a patient look A remark expressing careful consideration Facts learned by observing; "he reported his observations to the mayor" The act of noticing or paying attention; "he escaped the notice of the police" A building designed and equipped to observe astronomical phenomena A structure commanding a wide view of its surroundings The branch of science dealing with physical and biological aspects of the oceans (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun The phenomenon of not permitting the passage of electromagnetic radiation Incomprehensibility resulting from obscurity of meaning The quality of being opaque to a degree; the degree to which something reduces the passage of light The action of opposing something that you disapprove or disagree with; "he encountered a general feeling of resistance from many citizens"; "despite opposition from the newspapers he went ahead" The relation between opposed entities The act of hostile groups opposing each other; "the government was not ready for a confrontation with the unions"; "the invaders encountered stiff opposition" A contestant that you are matched against A body of people united in opposing something A direction opposite to another An armed adversary (especially a member of an opposing military force); "a soldier must be prepared to kill his enemies" The major political party opposed to the party in office and prepared to replace it if elected; "Her Majesty's loyal opposition" A very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images Clear homogeneous glass of known refractive index; used to make lenses An instrument designed to aid vision An astronomical telescope designed to collect and record light from cosmic sources The branch of physics that studies the physical properties of light Optical properties; "the optics of a telescope" Motion of an object in an orbit around a fixed point; "satellites in orbital rotation" The (usually elliptical) path described by one celestial body in its revolution about another; "he plotted the orbit of the moon" A particular environment or walk of life; "his social sphere is limited"; "it was a closed area of employment"; "he's out of my orbit" An area in which something acts or operates or has power or control: "the range of a supersonic jet"; "a piano has a greater range than the human voice"; "the ambit of municipal legislation"; "within the compass of this article"; "within the scope of an investigation"; "outside the reach of the law"; "in the political orbit of a world power" The path of an electron around the nucleus of an atom The bony cavity in the skull containing the eyeball Move in an orbit; "The moon orbits around the Earth"; "The planets are orbiting the sun"; "electrons orbit the nucleus" The act of orienting An integrated set of attitudes and beliefs Position or alignment relative to points of the compass or other specific directions A predisposition in favor of something; "a predilection for expensive cars"; "his sexual preferences"; "showed a Marxist orientation" A person's awareness of self with regard to position and time and place and personal relationships A course introducing a new situation or environment The place where something begins, where it springs into being; "the Italian beginning of the Renaissance"; "Jupiter was the origin of the radiation"; "Pittsburgh is the source of the Ohio River"; "communism's Russian root" Properties attributable to your ancestry; "he comes from good origins" An event that is a beginning; a first part or stage of subsequent events The point of intersection of coordinate axes; where the values of the coordinates are all zero The source of something's existence or from which it derives or is derived; "the rumor had its origin in idle gossip"; "vegetable origins"; "mineral origin"; "origin in sensation" The descendants of one individual; "his entire lineage has been warriors" Planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated in a clock The process of oscillating between states (physics) a regular periodic variation in value about a mean An unrestrained expression of emotion A sudden violent disturbance (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto) The state of being more than full A quantity that is more than what is appropriate; "four-year-olds have an overabundance of energy"; "we received an inundation of email" A layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun The transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus A parabolic reflector for light radiation A concave reflector used to produce a parallel beam when the source is placed at its focus or to focus an incoming parallel beam The apparent displacement of an object as seen from two different points that are not on a line with the object A unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years An eclipse in which the eclipsed body is only partially obscured A collimated flow of particles (atoms or electrons or molecules) A body having finite mass and internal structure but negligible dimensions A function word that can be used in English to form phrasal verbs Velocity with respect to the local standard of rest An apparatus consisting of an object mounted so that it swings freely under the influence of gravity A fringe region of partial shadow around an umbra (astronomy) the point in an orbit closest to the body being orbited Periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth Periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun An amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period" The interval taken to complete one cycle of a regularly repeating phenomenon (ice hockey) one of three divisions into which play is divided in hockey games A unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods" The end or completion of something; "death put a period to his endeavors"; "a change soon put a period to my tranquility" A punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations; "in England they call a period a stop" (computer science) electronic equipment connected by cable to the CPU of a computer; "disk drives and printers are important peripherals" On or near an edge or constituting an outer boundary; the outer area; "Russia's peripheral provinces"; "peripheral suburbs" Related to the key issue but not of central importance; "a peripheral interest"; "energy is far from a peripheral issue in the economy"; "peripheral issues" An unhappy and worried mental state; "there was too much anger and disturbance"; "she didn't realize the upset she caused me" (physics) a secondary influence on a system that causes it to deviate slightly Activity that is a malfunction, intrusion, or interruption; "the term `distress' connotes some degree of perturbation and emotional upset"; "he looked around for the source of the disturbance"; "there was a disturbance of neural function" A disposition that is confused or nervous and upset The branch of geology that studies rocks: their origin and formation and mineral composition and classification A particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle (physics) an ideal space in which the coordinate dimensions represent the variables that are required to describe a system or substance; "a multidimensional phase space" A fluorescence that persists after the bombarding radiation has ceased A cathode that emits electrons when illuminated Branch of chemistry that deals with the chemical action of light A transducer used to detect and measure light and other radiations A light-sensitive coating on paper or film; consists of fine grains of silver bromide suspended in a gelatin Photographic material consisting of a base of celluloid covered with a photographic emulsion; used to make negatives or transparencies Light-sensitive paper on which photograph can be printed A flat sheet of metal or glass on which a photographic image can be recorded A representation of a person or scene in the form of a print or transparent slide; recorded by a camera on light-sensitive material Record on photographic film; "I photographed the scene of the accident"; "She snapped a picture of the President" Undergo being photographed in a certain way; "Children photograph well" The act of taking and printing photographs The process of producing images of objects on photosensitive surfaces The occupation of taking and printing photographs or making movies Measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source Photographic equipment that measures the intensity of light Measurement of the properties of light (especially luminous intensity) A quantum of electromagnetic radiation; an elementary particle that is its own antiparticle The intensely luminous surface of a star (especially the sun) A cell that converts solar energy into electrical energy A meson involved in holding the nucleus together; produced as the result of high-energy particle collision (computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot); "the greater the number of pixels per inch the greater the resolution" A building housing an instrument for projecting the positions of the planets onto a domed ceiling An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome An apparatus or model for representing the solar systems A nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star Of or relating to or resembling the physical or orbital characteristics of a planet or the planets; "planetary motion"; "planetary year" Of or relating to or characteristic of the planet Earth or its inhabitants; "planetary rumblings and eructations"- L.C.Eiseley ; "the planetary tilt"; "this terrestrial ball" Having no fixed course; "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond" Involving the entire earth; not limited or provincial in scope; "global war"; "global monetary policy"; "neither national nor continental but planetary"; "a world crisis"; "of worldwide significance" One of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction A person who follows or serves another Any celestial body (other than comets or satellites) that revolves around a star The branch of physics concerned with matter in its plasma phase The colorless watery fluid of the blood and lymph that contains no cells, but in which the blood cells (erythrocytes, leukocytes, and thrombocytes) are suspended A green slightly translucent variety of chalcedony used as a gemstone (physical chemistry) a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a plasma when it is heated until the atoms lose all their electrons, leaving a highly electrified collection of nuclei and free electrons; "particles in space exist in the form of a plasma" A cartoon character created by Walt Disney (Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone A small planet and the farthest known planet from the sun; it has the most elliptical orbit of all the planets; "Pluto was discovered by Clyde Tombaugh in 1930" An optical device used to measure the rotation of the plane of vibration of polarized light The part of the Earth's surface forming a cap over a pole; characterized by frigid climate A long (usually round) rod of wood or metal or plastic A native or inhabitant of Poland One of two divergent or mutually exclusive opinions; "they are at opposite poles"; "they are poles apart" A linear measure of 16.5 feet A square rod of land One of two antipodal points where the Earth's axis of rotation intersects the Earth's surface A contact on an electrical device (such as a battery) at which electric current enters or leaves A long fiberglass sports implement used for pole vaulting Propel with a pole; "pole barges on the river"; "We went punting in Cambridge" Support on poles; "pole climbing plants like beans" Deoxidize molten metals by stirring them with a wooden pole The work of making something smooth and shiny by rubbing or waxing it; "the shining of shoes provided a meager living"; "every Sunday he gave his car a good polishing" Undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities The state of being polluted The act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors The particular portion of space occupied by something; "he put the lamp back in its place" A point occupied by troops for tactical reasons A way of regarding situations or topics etc.; "consider what follows from the positivist view" The arrangement of the body and its limbs; "he assumed an attitude of surrender" The relative position or standing of things or especially persons in a society; "he had the status of a minor"; "the novel attained the status of a classic"; "atheists do not enjoy a favorable position in American life" A job in an organization; "he occupied a post in the treasury" The spatial property of a place where or way in which something is situated; "the position of the hands on the clock"; "he specified the spatial relations of every piece of furniture on the stage" The appropriate or customary location; "the cars were in position" (in team sports) the role assigned to an individual player; "what position does he play?" The act of putting something in a certain place A condition or position in which you find yourself; "the unpleasant situation (or position) of having to choose between two evils"; "found herself in a very fortunate situation" A rationalized mental attitude An opinion that is held in opposition to another in an argument or dispute; "there are two sides to every question" An item on a list or in a sequence; "in the second place"; "moved from third to fifth position" The post or function properly or customarily occupied or served by another; "can you go in my stead?"; "took his place"; "in lieu of" The act of positing; an assumption taken as a postulate or axiom Cause to be in an appropriate place, state, or relation Put into a certain place or abstract location; "Put your things here"; "Set the tray down"; "Set the dogs on the scent of the missing children"; "Place emphasis on a certain point" An elementary particle with positive charge; interaction of a positron and an electron results in annihilation The mechanical energy that a body has by virtue of its position; stored energy Possession of controlling influence; "the deterrent power of nuclear weapons"; "the power of his love saved her"; "his powerfulness was concealed by a gentle facade" (physics) the rate of doing work; measured in watts (= joules/second) Possession of the qualities (especially mental qualities) required to do something or get something done; "danger heightened his powers of discrimination" (of a government or government official) holding an office means being in power; "being in office already gives a candidate a great advantage"; "during his first year in office"; "during his first year in power"; "the power of the president" A mathematical notation indicating the number of times a quantity is multiplied by itself Physical strength A state powerful enough to influence events throughout the world A very wealthy or powerful businessman; "an oil baron" Supply the force or power for the functioning of; "The gasoline powers the engines" The motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone The act of preceding in time or order or rank (as in a ceremony) The quality of being reproducible in amount or performance; "he handled it with the preciseness of an automaton"; "note the meticulous precision of his measurements" The act of predicting (as by reasoning about the future) A statement made about the future The force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit); "the compressed gas exerts an increased pressure" A force that compels; "the public brought pressure to bear on the government" The act of pressing; the exertion of pressure; "he gave the button a press"; "he used pressure to stop the bleeding"; "at the pressing of a button" The state of demanding notice or attention; "the insistence of their hunger"; "the press of business matters" The somatic sensation that results from applying force to an area of skin; "the sensitivity of his skin to pressure and temperature was normal" An oppressive condition of physical or mental or social or economic distress The pressure exerted by the atmosphere Exert pressure on someone through threats A polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms Optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image An analysis (often in graphical form) representing the extent to which something exhibits various characteristics; "a biochemical profile of blood"; "a psychological profile of serial killers" An outline of something (especially a human face as seen from one side) Biographical sketch Degree of exposure to public notice; "that candidate does not have sufficient visibility to win an election" A vertical section of the Earth's crust showing the different horizons or layers Write about; "The author of this article profiles a famous painter" Represent in profile, by drawing or painting An ancestor in the direct line The state of being prominent: widely known or eminent Relative importance The spreading of something (a belief or practice) into new regions The act of producing offspring or multiplying by such production The movement of a wave through a medium Something owned; any tangible or intangible possession that is owned by someone; "that hat is my property"; "he is a man of property"; A basic or essential attribute shared by all members of a class; "a study of the physical properties of atomic particles" Any area set aside for a particular purpose; "who owns this place?"; "the president was concerned about the property across from the White House" Any movable articles or objects used on the set of a play or movie; "before every scene he ran down his checklist of props" Counter tube whose output pulse is proportional to number of ions produced A stable particle with positive charge equal to the negative charge of an electron A degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation (electronics) a sharp transient wave in the normal electrical state (or a series of such transients); "the pulsations seemed to be coming from a star" A periodically recurring phenomenon that alternately increases and decreases some quantity The rhythmic contraction and expansion of the arteries with each beat of the heart; "he could feel the beat of her heart" An electronic counter that counts the number of electric pulses The rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health Edible seeds of various pod-bearing plants (peas or beans or lentils etc.) Expand and contract rhythmically; beat rhythmically; "The baby's heart was pulsating again after the surgeon massaged it" Produce or modulate (as electromagnetic waves) in the form of short bursts or pulses or cause an apparatus to produce pulses; "pulse waves"; "a transmitter pulsed by an electronic tube" Drive by or as if by pulsation; "A soft breeze pulsed the air" A quarter of the circumference of a circle Any of the four areas into which a plane is divided by two orthogonal coordinate axes The area enclosed by two perpendicular radii of a circle A measuring instrument for measuring altitude of heavenly bodies The construction of a square having the same area as some other figure The act of dividing into quanta or expressing in terms of quantum theory The branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states The branch of quantum physics that accounts for matter at the atomic level; an extension of statistical mechanics based on quantum theory (especially the Pauli exclusion principle) (physics) a physical theory that certain properties occur only in discrete amounts (quanta) (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3; "quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally" Fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet A starlike object that may send out radio waves and other forms of energy; many have large red shifts Measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects Velocity along the line of sight toward or away from the observer A field that represents the energy lost from the radiator to space The minute pressure exerted on a surface normal to the direction of propagation of a wave Energy that is radiated or transmitted in the form of rays or waves or particles The act of spreading outward from a central source Syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours; "he was suffering from radiation" The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay The spread of a group of organisms into new habitats A radial arrangement of nerve fibers connecting different parts of the brain (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance (chemistry) two or more atoms bound together as a single unit and forming part of a molecule An atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells" A person who has radical ideas or opinions (mathematics) a quantity expressed as the root of another quantity A character conveying the lexical meaning of a logogram (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem" (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative" Markedly new or introducing radical change; "a revolutionary discovery"; "radical political views" Arising from or going to the root or source; "a radical flaw in the plan" Of or relating to or constituting a linguistic root; "a radical verb form" Especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem; "basal placentation"; "radical leaves" The branch of astronomy that detects and studies the radio waves emitted by celestial bodies An electromagnetic wave with a wavelength between 0.5 cm to 30,000 m An electromagnetic wave frequency between audio and infrared Radio telescope that uses interference patterns from two antennas instead of a parabolic antenna Meter to detect and measure radiant energy (electromagnetic or acoustic) An object that radiates radio waves The entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television Astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources A measuring instrument (acoustic or optical or electronic) for finding the distance of an object Any element of the lanthanide series (atomic numbers 57 through 71) The relative magnitudes of two quantities (usually expressed as a quotient) The relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree; "an inordinate proportion of the book is given over to quotations"; "a dry martini has a large proportion of gin" English physicist who studied the density of gases and discovered argon; made important contributions to acoustic theory (1842-1919) Set that receives radio or tv signals (law) a person (usually appointed by a court of law) who liquidates assets or preserves them for the benefit of affected parties Earphone that converts electrical signals into sounds A person who receives something The tennis player who receives the serve A football player who catches (or is supposed to catch) a forward pass (physics) a combining of charges or transfer of electrons in a gas that results in the neutralization of ions; important for ions arising from the passage of high-energy particles (genetics) a combining of genes or characters different from what they were in the parents A small, old, relatively cool star; approximately 100 times the mass of Jupiter A large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding Optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; "Isaac Newton invented the reflecting telescope in 1668" A calm, lengthy, intent consideration The phenomenon of a propagating wave (light or sound) being thrown back from a surface Expression without words; "tears are an expression of grief"; "the pulse is a reflection of the heart's condition" A likeness in which left and right are reversed The image of something as reflected by a mirror (or other reflective material); "he studied his reflection in the mirror" (mathematics) a transformation in which the direction of one axis is reversed The ability to reflect beams or rays Optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece The angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction The change in direction of a propagating wave (light or sound) when passing from one medium to another The amount by which a propagating wave is bent The ratio of the velocity of light in a vacuum to that in a medium (physics) the theory that space and time are relative concepts rather than absolute concepts The quality of being relative and having significance only in relation to something else The time constant of an exponential return of a system to equilibrium after a disturbance Systematic investigation to establish facts A search for knowledge; "their pottery deserves more research than it has received" Attempt to find out in a systematically and scientific manner; "The student researched the history of that word" Inquire into; "the students had to research the history of the Second World War for their history project"; "He searched for information on his relatives on the web"; "Scientists are exploring the nature of consciousness" A formal expression by a meeting; agreed to by a vote The ability of a microscope or telescope to measure the angular separation of images that are close together The trait of being resolute; "his resoluteness carried him through the battle"; "it was his unshakeable resolution to finish the work" Finding a solution to a problem Something settled or resolved; the outcome of decision making; "they finally reached a settlement with the union"; "they never did achieve a final resolution of their differences"; "he needed to grieve before he could achieve a sense of closure" Analysis into clear-cut components (computer science) the number of pixels per square inch on a computer-generated display; the greater the resolution, the better the picture The subsidence of swelling or other signs of inflammation (especially in a lung) (music) a dissonant chord is followed by a consonant chord A statement that solves a problem or explains how to solve the problem; "they were trying to find a peaceful solution"; "the answers were in the back of the book"; "he computed the result to four decimal places" A decision to do something or to behave in a certain manner; "he always wrote down his New Year's resolutions" The extent to which something is delayed or held back Any agent that retards or delays or hinders; "flame-retardant" Lack of normal development of intellectual capacities The act of slowing down or falling behind (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees" A small stream A small channel (as one formed by soil erosion) A characteristic sound; "it has the ring of sincerity" A rigid circular band of metal or wood or other material used for holding or fastening or hanging or pulling; "there was still a rusty iron hoop for tying a horse" (chemistry) a chain of atoms in a molecule that forms a closed loop An association of criminals; "police tried to break up the gang"; "a pack of thieves" The sound of a bell ringing; "the distinctive ring of the church bell"; "the ringing of the telephone"; "the tintinnabulation that so voluminously swells from the ringing and the dinging of the bells"--E. A. Poe A platform usually marked off by ropes in which contestants box or wrestle Jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger; "she had rings on every finger"; "he noted that she wore a wedding band" A strip of material attached to the leg of a bird to identify it (as in studies of bird migration) Sound loudly and sonorously; "the bells rang" Ring or echo with sound; "the hall resounded with laughter" Make (bells) ring, often for the purposes of musical edification; "Ring the bells"; "My uncle rings every Sunday at the local church" Get or try to get into communication (with someone) by telephone; "I tried to call you all night"; "Take two aspirin and call me in the morning" Extend on all sides of simultaneously; encircle; "The forest surrounds my property" Attach a ring to the foot of, in order to identify; "ring birds"; "band the geese to observe their migratory patterns" The act of rotating as if on an axis; "the rotation of the dancer kept time with the music" (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin A single complete turn (axial or orbital); "the plane made three rotations before it crashed"; "the revolution of the earth about the sun takes one year" A planned recurrent sequence (of crops or personnel etc.); "crop rotation makes a balanced demand on the fertility of the soil"; "the manager had only four starting pitchers in his rotation" (statistics) the selection of a suitable sample for study Items selected at random from a population and used to test hypotheses about the population Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form) Any celestial body orbiting around a planet or star Broadcast or disseminate via satellite Surrounding and dominated by a central authority or power; "a city and its satellite communities" A giant planet that is surrounded by three planar concentric rings of ice particles; the 6th planet from the sun (Roman mythology) god of agriculture and vegetation; counterpart of Greek Cronus; "Saturday is Saturn's Day" A small number (of something) dispersed haphazardly; "the first scatterings of green"; "a sprinkling of grey at his temples" The physical process in which particles are deflected haphazardly as a result of collisions A light shower that falls in some locations and not others nearby